Yesterday, we took a look at the snap-ring dial Charles P. Corliss patented in 1879 in an attempt to create an “interchangeable” watch while working at the Elgin National Watch Company. This development was made while the company was also introducing a new interchangeable movement, frequently referred to by collectors as the “convertible” model. A few years later, when Elgin decided to create a new 18-Size pendant-set model derived from the established 16-Size convertible design, they turned to Corliss for the setting mechanism. This stem winding/setting mechanism represents the first of four distinct designs patented by Corliss during his nearly-three-decades as model maker at the Elgin factory. The interchangeable movement design also required additional ingenuity since a specialized wheel must rise and fall in order to engage the center spur wheel to set the hands.